Futurum - Building material road concrete

Concrete as a construction material for road pavements has proven its worth for a long time. For decades, concrete pavements have been able to meet the highest requirements for durability, sustainability, load-bearing capacity, safety and economy. Since the end of the 1990s, however, the concrete construction method has been increasingly called into question due to damage caused by or involving ASR, and investigations into the causes of the damage have begun. Based on this state of knowledge, here:
- a condition analysis of potentially ASR-damaged and undamaged BAB sections was carried out,
- the ASR damage potential of pavement concretes exposed to NaCl was examined,
- as much data as possible on the selected BAB sections was researched and evaluated,
- investigations were carried out, and influencing factors
- and identified influencing factors, dependencies and interactions.
The results of the investigations on a total of 53 BAB sections initially confirmed the known state of knowledge on ASR, a complex long-term reaction that is controlled by a large number of influencing factors. The relevance of many influencing factors on ASR in pavement concretes was clarified, although no new, previously completely unknown influencing factors could be identified. It should be emphasized that on sections built after 2005, a sufficiently low ASR damage potential could be demonstrated in all cases. This confirms that the regulations in force since 2005 are effective in preventing ASR damage much better in the future. The possibility to evaluate data for such a large number of AOD sections for the first time resulted in the following new recommendations and approaches for further work:
- a recommendation on the procedure for sampling, diagnosis and prognosis of pavement concretes,
- the derivation of a new diagnostic parameter for characterizing the degree of damage to concrete,
- the determination of the expected service life or remaining service life of pavement concretes
- the possibility of further verification of the developed methods and new findings through future monitoring of sampled roadway sections.